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计算下面各题.(能够简便计算的要求简便计算)45×19+4680÷12=925÷6+1÷6×6259.8×[3.45-(3.85-0.47)][12−(34−35)]÷710.

题目详情
计算下面各题.(能够简便计算的要求简便计算)
45×19+4680÷12=
9
25
÷6+1÷6×
6
25
9.8×[3.45-(3.85-0.47)] [
1
2
−(
3
4
3
5
)]÷
7
10
▼优质解答
答案和解析

(1)45×19+4680÷12,
=855+390,
=1245;
(2)
9
25
÷6+1÷6×
6
25

=
9
25
×
1
6
+
1
6
×
6
25

=(
9
25
+
6
25
)×
1
6

=
3
5
×
1
6

=
1
10

(3)9.8×[3.45-(3.85-0.47)],
=9.8×[3.45-3.38],
=9.8×0.07,
=0.686;
(4)[
1
2
−(
3
4
3
5
)]÷
7
10

=[
1
2
-
3
20
]÷
7
10

=
7
20
÷
7
10

=
1
2